Dating a vintage omega pocket watch
For example, the 30T2 PC and 30T2 PC AM are both signed 30T2 PC, because the only difference is an anti-magnetic balance in the AM version.
From the late 1940s on, the number was located on one of the bridges, usually the same one as the serial number. In pocket watches from the early 1900s, you can find it on the dial side of the baseplate.In other words, you have to disassemble the watch to access it.Later on, the serial was always on one of the bridges.It’s always good to check that out when looking at a movement. 265 with a flat hairspring, while it’s supposed to have a Breguet overcoil, you can be sure that it’s actually a 269 movement with the wrong balance.
The 30T2 had a few chronometer versions, all of a higher grade than the non-chronometer versions. You can easily recognize the RG by its distinctive regulator.
321 but it has a silvery finish on the plates, cocks, and bridges, and it doesn’t have the 321 marking, it’s simply not a 321.